I attached a photo to a post, http://www.discusscooking.com/forum...er-like-right-now-11626-1645.html#post1554143, in the thread about weather. I uploaded a .png file, but it seems to have been changed to a .jpg. The picture is smaller and the resolution seems worse. In this particular case, that isn't really a problem. How do I make sure this doesn't happen with a picture where it would matter?